1988-09-01
1989-05-30
Adams, Russell E.
354406, G03B 300
Patent
active
048355615
ABSTRACT:
A focus detecting device which is capable of focus detection under both passive and active type of autofocussing modes. The device has a light projecting element which projects light at specific wavelengths in a boundary region between visible light and infrared light, and a sensor which is responsive to both ambient light and the light projected from the light projecting element. A correction unit corrects chromatic aberration information stored in the photographing lens on the basis of the results of arithmetic operation of the output signals from the sensor generated with the light projecting member activated and deactivated. In the active type of autofocussing mode, utilizing the light projected from the light projecting element, the result of the focus detection is corrected by the corrected chromatic aberration information while the result of the focus detection is not subjected to any correction in the passive type of autofocussing mode utilizing the ambient light.
REFERENCES:
patent: 4504135 (1985-03-01), Kawabata
patent: 4511232 (1985-04-01), Yamada
patent: 4523828 (1985-06-01), Kato
patent: 4571047 (1986-02-01), Hirai
patent: 4595271 (1986-06-01), Suda et al.
patent: 4602861 (1986-07-01), Taniguchi et al.
Adams Russell E.
Minolta Camera Kabushiki Kaisha
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